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You can leave the pump on with the gear (air compressor too), just makes it heavier and more awkward. I believe those pump gears are tapered and not keyed so their timing can be adjusted. The 8.3 I did was a ISC and those pumps don't require timing as it's a common rail design. I hear that cam...

Not to bad of a job, the gears that need to be timed have timing marks you line up and a good gear puller can save you headache from having to pull the cam. I have never done one in a truck, rather on a stand but the last one I did the cover itself used RTV gasket and the new front crank seal...